Materials system for high strength corrosion resistant bimetallic products
First Claim
Patent Images
1. A specific materials system for bimetallic products suitable for low-temperature service up to about 500°
- F., having a yield strength of about 90,000 psi produced by;
(a) diffusion bonding an age-hardenable low alloy steel, to an austenitic stainless steel at a temperature of between 1700°
F. and 2300°
F.;
(b) heating the resulting composite to about 1650°
F. for at least fifteen minutes;
(c) water quenching the heated material;
(d) aging the quenched material at between about 900°
F. and 1100°
F. for a maximum of one hour; and
(e) air cooling the aged material.
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Abstract
A specific material system for bimetallic products is produced by diffusion bonding an age-hardenable low alloy steel with austenitic stainless steel at an elevated temperature, followed by a two step austenitizing and aging process. The resulting material combination is characterized by desirably metallurgical and structural properties in the low alloy steel component and by high corrosion resistance in the stainless steel component with virtual elimination of detrimental carbon migration across the diffusion bond from the low alloy steel to the austenitic steel.
21 Citations
14 Claims
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1. A specific materials system for bimetallic products suitable for low-temperature service up to about 500°
- F., having a yield strength of about 90,000 psi produced by;
(a) diffusion bonding an age-hardenable low alloy steel, to an austenitic stainless steel at a temperature of between 1700°
F. and 2300°
F.;(b) heating the resulting composite to about 1650°
F. for at least fifteen minutes;(c) water quenching the heated material; (d) aging the quenched material at between about 900°
F. and 1100°
F. for a maximum of one hour; and(e) air cooling the aged material. - View Dependent Claims (3, 4, 5, 6, 7)
- F., having a yield strength of about 90,000 psi produced by;
-
2. A specific materials system for bimetallic products suitable for low-temperature service up to about 500°
- F., having a yield strength of about 90,000 psi produced by;
(a) diffusion bonding an age-hardenable low alloy steel to an austenitic stainless steel at a temperature of between 1700°
F. and 2300°
F.;(b) heating the resulting composite to about 1650°
F. for at least fifteen minutes;(c) air cooling the heated material; (d) aging the aircooled material at between about 900°
F. and 1100°
F. for a maximum of one hour; and(e) air cooling the aged material.
- F., having a yield strength of about 90,000 psi produced by;
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8. A method of producing a specific materials system for bimetallic products suitable for low-temperature service up to about 500°
- F., having a yield strength of about 90,000 psi which comprises;
(a) diffusion bonding an age-hardenable low alloy steel to an austenitic stainless steel at a temperature of between 1700°
F. and 2300°
F.;(b) heating the resulting composite to about 1650°
F. for at least fifteen minutes;(c) water quenching the heated material; (d) aging the quenched material at between 900°
F. and 1100°
F. for a maximum of one hour; and(e) air cooling the aged material. - View Dependent Claims (10, 11, 12, 13, 14)
- F., having a yield strength of about 90,000 psi which comprises;
-
9. A method of producing a specific materials system for bimetallic products suitable for low-temperature service up to about 500°
- F., having a yield strength of about 90,000 psi which comprises;
(a) diffusion bonding an age-hardenable low alloy steel to an austenitic stainless steel at a temperature of between 1700°
F. and 2300°
F.;(b) heating the resulting composite to about 1650°
F. for at least fifteen minutes;(c) air cooling the heated material; (d) aging the air cooled material at between 900°
F. and 1100°
F. for a maximum of one hour and(e) air cooling the aged material.
- F., having a yield strength of about 90,000 psi which comprises;
Specification